Ben Reeves, Will Grigg and Dele Alli linked up with their respective national sides on Monday.
The Green and White Army will face the Faroe Islands on Saturday 11th October in their first home game of the campaign, before travelling to the Karaiskakis Stadium to play Greece on Tuesday 14th October.
Northern Ireland beat Hungary 2-1 in their opening qualifier back in September.
Alli, meanwhile, has joined up with England Under-19s for the First Qualifying Round of the European Championships.
The midfielder, who made his first Under-19s appearance in the 1-1 draw with Germany last month, could feature in three games– against Belarus on Friday 10th October, the host nation Luxembourg on Sunday 12th October and finally Belgium on Wednesday 15th October.
The top two teams from the group will progress to the Elite Qualifying Round, which takes place next spring.
As a result of their call-ups, all three players will miss Tuesday’s Johnstone’s Paint Trophy clash with AFC Wimbledon.